Question about Craftsman 25cc Gas Line Trimmer

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Fuel lines rotted...need to know how they connect to gas tank/primer/and carb

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This is an ongoing issue for users, and rightfully so. Small diameter line out of fuel tank (has filter in-tank on end) connects to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then pushes any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Years ago on 2-stroke trimmers, primers were not even used,...you choked the carb with a slide lever and gravity let fuel enter the carb from above...a few pulls, a "pop"...slide it off of choke and away you went.
If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Please vote on this solution.

Posted on Sep 05, 2010

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Posted on Jan 02, 2017

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Poulan chain saw model #2025 - fuel lines dry rotted and disintegrated. There are 3 fuel lines: l from gas tank and 2 from primer button but only 2 fuel ports on the carb. What goes where and how?


You should have 2 to the tank, the one with filter coming from tank goes to nipple on right side of carb, the nipple on left side by primer bulb goes to primer bulb and other from primer bulb back to tank as return line, how it should work is when you push primer bulb it pulls fuel from tank through carb and back to tank on return line so watch in tank orleave one line out that you think is return line and see if gas comes out when you prime, but remember it goes through the carb first before it goes back to tank, had a pic but too big to put on site sorry, 2StrokeJim

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1 Answer

Need to know how gas lines go on a RGB3100 they rotted off need to see a diagram


I don't have a diagram, but I can explain to you the fuel line routing.
The small diameter line out of fuel tank (has filter in-tank on end) connects directly to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then "pushes" any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. This is the return line. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb. If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where sometimes the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Otherwise, the line should enter the tank for about 1/2" or so.

Jun 12, 2011 | Ryobi Garden

1 Answer

There are two outlets on the primer bulb for fuel mine rotted away while my son had it . I need to know which tube goes to where when i replace it.


Ok...follow these instructions closely and you will know.
The small diameter line out of fuel tank (has filter in-tank on end) connects directly to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then "pushes" any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. This is the return line. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb. If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where sometimes the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Otherwise, the line should enter the tank for about 1/2" or so.

May 17, 2011 | Garden

1 Answer

Have a poulan pro ppb150 thegas lines rotted in tank there are two line in tank a fuel line and apurge line cannot find a schematic showing wich line goes to filter and which line goes to purge and...


The fuel line from the fuel tank, with the filter on the end goes to the fuel inlet connection on the carb, this is the connection nearest to the alloy pump cover on the carb, the other connection on the carb has a pipe to the shortey connection on the back of the primer ( the suction side ) the longer connection on the primer ( pressure side ) has a pipe that goes back to the tank, it just pushes into the top of the tank, to re cap the primer pulls fuel from the carb, and dumps it back to the tank.

Apr 21, 2011 | Garden

1 Answer

I HAVE A RYOBI VAC/BLOWER MODEL RGBV3100 THE FUEL LINES NEED REPLACING THEY ROTTED OFF NEED TO KNOW WHICH WAY TO ROUTE FROM PRIMER BUTTON TO CARB


The small diameter line out of fuel tank (has filter in-tank on end) connects directly to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then "pushes" any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Again, on the primer bulb, the longer nipple has a line going directly from it to the tank. This is the return line. The shorter nipple on the bub has a line from it going to the metering chamber side of the carb. If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where sometimes the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank. Otherwise, the line should enter the tank for about 1/2" or so

Feb 18, 2011 | Ryobi Garden

1 Answer

Trying to replace the fuel line and the primer hose both were rotted off not sure what goes where on my poulan pro ppb200 31cc string trimmer there are two lines into the tank the primer wont fill i have...


The smaller line is connected to the fuel filter in the tank and goes on the carb body opposite the end with the hole in the cover. A larger diameter line coming out of the tank is the fuel return line and has the little connector on it just inside the tank to hold it in place there
It goes on the carb body (if primer is on carb) by the bulb.
If there is an external bulb...the small line is the same...there would be a larger line going from the carb body (nearest the end with a hole in the cover) to the smaller nipple on the primer bulb. A third larger diameter line would be connected to the larger nipple on the primer bulb and running to the little nylon connector inside the tank. This is the fuel return line and the smaller diameter line is of course the fuel supply line.

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2 Answers

I need to know how the fuel lines are hooked up in my ryobi gas trimmer. All of the fuel lines rotted out. I took them out and I need to know the correct connection sequences (what goes where).


line runs from little filter in tank to carb.
line from carb. to primer bulb
line from primre bulb back to gas tank.
lines are 2 sizes
need to cut at angle end of lines in tank so you can get them thru holes
and grab with needle nose plyers and pull them thru.
make sure you put the little filter on end before you pull line thru and leave
enough so filter can move around the whole tank.
second line in tank is smaller and need to cut and pull it thru hole in tank to primer bulb

Jun 23, 2010 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

2 Answers

Fuel line connection


Fuel filter to bottom of carb. The suction port of primer to the top of carb outlet line to other port to tank.
To tell which port is outlet put your finger on one port and push bulb if the bulb collapses and doesn't return then that is the inlet (suction) side.
Good luck

Aug 25, 2009 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

1 Answer

Mcculloch gas chain saw / 3200 changed fuel hoses due to rot


The line from carb goes to bulb inlet, the bulb outlet goes to tank. Line with filter goes to carb inlet.

Mar 21, 2009 | McCulloch 26cc Gas Blower Mcb3208

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